Coulomb's Law Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t5-168

Effect

Computation or source lookup only

Input and validation requirements

The zero-separation input produces an undefined result and must be rejected. The specification also leaves unit conversion, signed-versus-magnitude force reporting, and the zero-force direction convention unspecified.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "q1": 2,
    "q1_unit": "μC",
    "q2": 3,
    "q2_unit": "μC",
    "r": 0.5,
    "r_unit": "m"
  },
  "expected_outputs": {
    "F_N": 0.2157012430152,
    "direction": "repulsive"
  },
  "working": "q1=2×10^-6 C; q2=3×10^-6 C. q1q2=(2×10^-6)(3×10^-6)=6×10^-12 C². r²=(0.5)²=0.25 m². F=8.9875517923×10^9×(6×10^-12)/0.25=8.9875517923×10^9×2.4×10^-11=0.2157012430152 N. Both charges have the same sign, so the force is repulsive."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche5/tranche5-results.json